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Delphi

Unit1.pas：源码内容

							unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, IdBaseComponent, IdComponent, IdTCPConnection,
  IdTCPClient, IdTelnet;
type
  TForm1 = class(TForm)
    IdTelnet1: TIdTelnet;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;
                  
var
  Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.Button1Click(Sender: TObject);
begin
        if( not IdTelnet1.Connected ) then
        begin
                IdTelnet1.Connect;
        end
end;
end.

						